xref: /openssl/providers/common/digest_to_nid.c (revision 7ed6de99)
1 /*
2  * Copyright 2020-2024 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 #include "internal/deprecated.h"
11 
12 #include <openssl/objects.h>
13 #include <openssl/core_names.h>
14 #include <openssl/evp.h>
15 #include <openssl/core.h>
16 #include "prov/securitycheck.h"
17 #include "internal/nelem.h"
18 
19 /*
20  * Internal library code deals with NIDs, so we need to translate from a name.
21  * We do so using EVP_MD_is_a(), and therefore need a name to NID map.
22  */
ossl_digest_md_to_nid(const EVP_MD * md,const OSSL_ITEM * it,size_t it_len)23 int ossl_digest_md_to_nid(const EVP_MD *md, const OSSL_ITEM *it, size_t it_len)
24 {
25     size_t i;
26 
27     if (md == NULL)
28         return NID_undef;
29 
30     for (i = 0; i < it_len; i++)
31         if (EVP_MD_is_a(md, it[i].ptr))
32             return (int)it[i].id;
33     return NID_undef;
34 }
35 
36 /*
37  * Retrieve one of the FIPS approved hash algorithms by nid.
38  * See FIPS 180-4 "Secure Hash Standard" and FIPS 202 - SHA-3.
39  */
ossl_digest_get_approved_nid(const EVP_MD * md)40 int ossl_digest_get_approved_nid(const EVP_MD *md)
41 {
42     /* TODO: FIPS 180-5 RFC 8692 RFC 8702 allow SHAKE */
43     static const OSSL_ITEM name_to_nid[] = {
44         { NID_sha1,      OSSL_DIGEST_NAME_SHA1      },
45         { NID_sha224,    OSSL_DIGEST_NAME_SHA2_224  },
46         { NID_sha256,    OSSL_DIGEST_NAME_SHA2_256  },
47         { NID_sha384,    OSSL_DIGEST_NAME_SHA2_384  },
48         { NID_sha512,    OSSL_DIGEST_NAME_SHA2_512  },
49         { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },
50         { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },
51         { NID_sha3_224,  OSSL_DIGEST_NAME_SHA3_224  },
52         { NID_sha3_256,  OSSL_DIGEST_NAME_SHA3_256  },
53         { NID_sha3_384,  OSSL_DIGEST_NAME_SHA3_384  },
54         { NID_sha3_512,  OSSL_DIGEST_NAME_SHA3_512  },
55     };
56 
57     return ossl_digest_md_to_nid(md, name_to_nid, OSSL_NELEM(name_to_nid));
58 }
59